An object detection apparatus mountable to a moveable apparatus for detecting an object existing outside the moveable apparatus by capturing a plurality of images using a plurality of imaging devices mounted to the moveable apparatus and generating a disparity image from the captured images includes a map generator to generate a map indicating a frequency profile of disparity values correlating a horizontal direction distance of the object with respect to a movement direction of the moveable apparatus, and a distance to the object in the movement direction of the moveable apparatus based on the disparity image, an isolated area detection unit to detect an isolated area based on the frequency profile, an isolated area divider to divide the isolated area into two or more isolated areas based on the frequency profile in the isolated area, and an object detector to detect an object based on the divided isolated area.